Snare Stabilizers Prevent Twisting in Medical Tissue Resection
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Solution Overview
Problem
Conventional snare devices used in medical procedures tend to twist and rotate away from the plane of tissue, reducing their ability to effectively ensnare and resect tissue due to instability, especially when engaging with or retracting from tissue.
Innovation Solution
The design incorporates stabilizers, such as asymmetric and offset peaks, and securement mechanisms like clam shell constructions and varied cross-sectional profiles, to prevent twisting and ensure consistent force distribution, maintaining the snare's stability and ability to engage tissue effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional snare devices use thin atraumatic tips, then tissue trauma is reduced, but the snare loop tends to twist about itself away from the plane of tissue
Solution Approach 1:
The snare device is divided into distinct functional segments: a stable proximal portion with stabilizing features and a flexible distal tip portion. This segmentation allows the proximal segment to provide structural stability while the distal segment maintains flexibility for tissue engagement, resolving the contradiction between stability and trauma reduction.
Solution Approach 2:
The stabilizing features include asymmetric cross-sectional geometries and non-uniform thickness distributions in the proximal portion of the snare device. These asymmetric features create inherent structural stability that prevents twisting, while the distal tip maintains a more symmetric, flexible configuration for gentle tissue contact.
2Ease of operation
If the snare loop is made flexible to engage tissue, then tissue ensnarement ability is improved, but the snare twists and rotates away from the plane of tissue
Solution Approach 1:
The snare device employs dynamic stiffness characteristics where the proximal portion maintains higher stiffness for stability, while the distal tip portion has lower stiffness for flexibility. This dynamic gradient allows the device to exhibit different mechanical behaviors in different regions, enabling both planar stability and effective tissue engagement.
Solution Approach 2:
The stabilizing features extend the structural support into additional spatial dimensions through asymmetric cross-sectional geometries and three-dimensional stabilizing elements. This dimensional extension provides rotational and lateral stability without constraining the planar flexibility needed for tissue engagement.
3Stability of the object's composition
If stabilizing features are added to prevent twisting, then snare stability is improved, but device complexity increases
Solution Approach 1:
Stabilizing features are applied locally only to the proximal portion of the snare device where structural stability is needed, while the distal tip portion maintains a simple, flexible construction. This localized application of complexity resolves the contradiction by providing stability where required without unnecessarily complicating the entire device.
Solution Approach 2:
The stabilizing features utilize variations in geometric parameters such as cross-sectional shape, thickness, and material distribution in the proximal portion. These parameter changes provide structural stability through design optimization rather than adding complex mechanical components, thereby minimizing device complexity while achieving the desired stability.
Data Source
AI summary
A medical device may include an insertion device having a proximal end, a distal end, and a lumen extending therethrough. The medical device may further include a snare device configured to transition between a contracted state within the lumen of the insertion device, and an expanded state extending distally of the insertion device. The snare device may include a loop including a pair of legs and a distal tip. The distal tip may include a plurality of stabilizers between the pair of legs.